If I remember correctly, most of those doubles were scored when national players were not around. Also, they were scored towards end of the league when wickets became flatter and bowlers were struggling with their endurance.

Atleast Marshall and Mehrab scored their doubles in presence of national players, although on a very flat track (according to Nannu's comment).

Thanks for the list.
So both Nazimuddin and Marshal Ayub have 2 double century. I hope Ayub will do good in intentional level. Nazimuddin is always good in domestics.But never did well in international level.